+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   120820 (1998 HL89) Classification: Main-belt Asteroid          SPK-ID: 2120820 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 24 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .08370461616304152 4.0876e-08   a 2.745442232845515 1.6604e-08 au q 2.515636044547378 1.1843e-07 au i 13.51992166219317 4.6037e-06 deg node 206.9134504986959 1.6717e-05 deg peri 302.2472907227201 3.7096e-05 deg M 6.63222464683956 2.9712e-05 deg tp 2458969.889274738585 (2020-Apr-30.38927474) 0.0001372 TDB period 1661.56330355317 4.55 1.5073e-05 4.127e-08 d yr n .2166634272857122 1.9655e-09 deg/d Q 2.975248421143653 1.7994e-08 au   Orbit Determination Parameters    # obs. used (total)      895      data-arc span      8038 days (22.01 yr)      first obs. used      1998-04-21      last obs. used      2020-04-23      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .55092      source      ORB      producer      Otto Matic      solution date      2020-May-20 20:40:11   Additional Information  Earth MOID = 1.55048 au   Jupiter MOID = 2.07308 au   T_jup = 3.303  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.0   n/a MPO453678   120820 (1998 HL89)          Discovered 1998-Apr-21 by LINEAR at Socorro Reference: 20060314/Numbers.arc Last Updated: 2006-03-23 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Oct-25 08:30 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin